On Mon, 16 Mar 2009, Dave Markham wrote:

> Guys we have installed an Ultra320 HBA into an E220R in slot1 (66mhz)
> and attached dual scsi to an SL24 with 2 half heigh LTO3 drives. 1
> Channel per tape drive.  Single Master/Media combo
>
> This is all on Solaris 9 with Netbackup 5.0mp7.
>
> I wont go into the details but suffice to say the customer won't spend
> any money on backups but of course needs them to work. We only got the
> new SL24 due to the previous L1000 falling over constantly and not being
> able to get support on it easily.
>
> Anyway...
>
> I have installed all this, but am getting quite poor speeds on backups.
>
> doing a ufsdump or tar from base os doesnt get much speed and using
> netbackup gets higher speeds due to :-
>
> /usr/openv/netbackup/db/config/NUMBER_DATA_BUFFERS = 16
> /usr/openv/netbackup/db/config/SIZE_DATA_BUFFERS = 262144
>
> We have also added the tuning parameters into /etc/system for shared
> memory etc.
>
> I havn't messed with the st.conf and just let the drive do what it wants
> but was after any tips if that is the next area to focus on.
>
> Currently getting about 8 - 25mb/s on backups depending on amount of
> jobs running.
>
> e.g just doing a local backup of master server direct to the drive gets
> average :-
>
> root@host-SL24# grep Kbytes/sec log.031609
> 15:26:35.390 [16237] <4> write_backup_completion_stats: successfully
> wrote 1 of 1 multiplexed backups, total Kbytes 6175485 at 10395.319
> Kbytes/sec
> root@host-SL24#
>
> I need to check the HBA is running at 320. I can't see any messages from
> dmesg or /var/adm/messages saying its been downgraded to ultra160 but it
> may be hidden elsewhere?
>
> Cheers
> _______________________________________________
> Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
> http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
>

What speed is your NIC?  Your SIZE data buffers is good but your NUMBER
data buffers should probably be set to at least 32.  The half-height drives
may write a little slower but IMO they should be faster than that speed.

Do you have both drives on the same port of the SCSI card?  Only attach
one drive per-port for maximum speed.  What speeds do you get when you, e.g.,
FTP from boxA to the master? 100MiB/s?

Justin.

_______________________________________________
Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu